Home > Storage > PowerMax and VMAX > Storage Admin > Reliability, Availability, and Serviceability on PowerMax 2500 and 8500 Arrays > I/O Modules
I/O modules share some common attributes. All are hot swappable, meaning online add/remove/change of the modules is supported. I/O Modules have either two ports numbered 0 - 1 or four ports numbered 0 - 3.